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Sierra, one of the fastest supercomputers in the world, will serve the National Nuclear Security Administration’s three nuclear security laboratories, providing high-fidelity simulations in support of NNSA’s core mission of ensuring the safety, security and effectiveness of the nation’s nuclear stockpile. The supercomputer is NNSA’s first large-scale production heterogeneous system, incorporating both IBM central processing units (CPUs) and NVIDIA graphics processing units (GPUs), enabling faster, more predictive simulations and adding capabilities for applying machine learning and artificial intelligence to massive datasets.